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Relevant Information:

Occurs in most habitat types, but
most frequent in large muddy rivers, with slow current and soft
bottom. Enters flooded forest. Feeds on exogenous insects, aquatic
insect larvae, shrimps, other crustaceans and fishes. Moves into
flooded forests to spawn and the young are usually first seen
in August. In Tonlé Sap (Cambodia), maximum numbers are
found as it returns to rivers in November and December. A highly
priced aquarium fish. Usually marketed fresh and is high in nutritive
values especially omega-3 fatty acids. Aquarium Care:
As with most of the genus, H. nemerus can become a pretty
nasty character in your fish tanks and if housed with other fish
can be lethal. Cichlids such as the Pikes from the Crenichla
genus that can look after themselves would be the best bet
for other tankmates. I have housed them with Synodontis
and they can make a lot of damage to their fins and can kill smaller
specimens by charging them midriff and causing internal injuries.
Not to be trusted with other fish. If kept with other fish they
will have to be able to look after themselves. Diet: Whilst
this catfish is best described as a predator/carnivore in its
natural habitat feedings of fish, insects, shrimps and other crustaceans,
in captivity this catfish will feed on mussels, prawns, pieces
of fish, earthworms and will even take prepared foods such as
catfish pellets.